R/O filters

[weaselslucks]

could someone explaine to me how to set up a r/o unit like this one?
http://www.marinedepot.com/aquarium_reverse-osmosis-deionization_captive_purity.asp?CartId=

i know it takes out the bad stuff in water but is it economical and whats a good one to use for a 29 gallon?

[weaselslucks]

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